package com.greenline.pay.web.common.utils;

import javax.servlet.http.HttpServletRequest;

/**
 * @Type IpUtil
 * @Desc ip工具类
 * @author jianyun.zheng
 * @date 2012-9-29
 * @Version V1.0
 */
public class IpUtil {
    /**
     * 从request里取得真是ip
     * 
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}
